code submission

I'm looking at adding a loop and BPM toolbar to Audacity for internal
use at our company (think a simple version of Recycle).   I'm happy to
contribute what I create back to the official app.   I have a couple
of questions:

1) Though an archive search didn't turn up much of anything, I'm sure
this type of functionality has been discussed before.  Is someone
already working on loop editing functionality?

2) If it has been discussed before, does anyone remember any
minefields (either in the code or with the philosophy)?

3) How "complete" does my code need to be before I can submit a first
diff for comment?

4) Other than the Audacity sourcecode itself, are there any code style
guidelines or templates?

Thanks,
Patrick Roberts

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